This science ClipArt gallery offers 46 illustrations of levers. Levers use a rigid object with a fulcrum or pivot point, and by doing so multiply the mechanical force applied to another object.

### Chipping Knife

"The common chipping-knife, used by apothecaries, and represented [here], is a familiar illustration…

### Compound Lever

"When several simple levers are connected together, and act one upon the other, the machine is called…

### Compound Lever

"In compound levers, equilibrium is established when the power, multiplied by the first arms of all…

### Crowbar

"... shows one of the commonest (sic) forms in which this kind of lever appears,-the crowbar. The power…

### Crowbar and Stone

"... a farmer with a crowbar, as shown, can move a rock which with his hands alone he could not stir."…

### First Class Lever

A lever of the first class

### First Class Lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the fulcrum is…

### First class lever

"First class lever." -Comstock 1850

### First Class Lever

"A Lever of the First Kind is one in which the fulcrum is between the power and the weight... where…

### First-class Lever

"First class lever." -Comstock 1850

### Man with Lever and Fulcrum

"In mechanics, the point of rest about which a lever turns in lifting a body; also, a prop or support…

### Man Using Lever and Fulcrum to Lift Rock

"In mechanics, the word 'machine' signifies an instrument for the conversion of motion or the transference…

### Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

### Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

### Lever

"The object W to be lifted is called the weight; the force is represented by P; the point, or pivot,…

### Lever of the first class

Lever of the first class.

### Lever of the second class

Lever of the second class.

### Lever of the third class

Lever of the third class.

### First Class Lever

"The lever of the first class has the fulcrum between the power and the weight." Examples: a common…

### First Class of Lever: Fulcrum Between Power and Weight

This illustration shows the first class of lever. This class employs a fulcrum between the power and…

### First Kind of Lever

"In straight levers of the first kind, the fulcrum is between the power and the resistance, as in fig…

### Second Class Lever

"The lever of the second class has the weight between the power and the fulcrum." Examples: a nutcracker,…

### Second Kind of Lever

"In the second order of levers, the resistance is between the fulcrum and the power; and, as before,…

### Third Class Lever

"The lever of the third class has the power between the weight and the fulcrum." Examples: sewing machine…

### Third Kind of Lever

"In the third order of lever the power acts between the prop and the resistance, where also P : W ::…

### Simple Machines

Images of different points about a fulcrum F. P is the power exerted on the object, W is the weight.

### Simple Machines

Each of these are an example of the simple machine: lever. F c is the power arm and F w is the weight…

### Lever Safety-valve

A safety-valve, in which a weight is employed. Here a is the valve, b b the boiler, c c the valve-seat,…

### Scissors

"Many instruments in common use are on the principle of this kind of lever. Scissors, consists of two…

### Second Class Lever

A lever of the second class

### Second Class Lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the weight is…

### Second-class Lever

"The second kind of lever is represented where W is the weight, L the lever, F the fulcrum, and P a…

### Second-class Lever

"Two men carrying a load between them on a pole is also and example of this [second class] kind of lever.…

### Second-class lever

"Second class lever." -Comstock 1850

### Second Class Lever

"A Lever of the Second Kind is one in which the weight is between the power and the fulcrum." —Quackenbos…

### Simple Lever

"Any rod, or bar, which is used in raising a weight, or surmounting a resistance, by being placed on…

### Simple lever system

"Suppose that A is the lever, B the fulcrum, D the weight to be raised, and C the power. Let D by considered…

### Simple Lever System

"Suppose the weight, B to be sixteen pounds and suppose the fulrum to be placed so near it, as to be…

### Simple Lever System

"But let the fulcrum be moved along to the middle of the lever, with the weight of sixteen pounds still…

### Spike Extractor

"An apparatus for extracting spikes, as from a rail. a, rail; b, spike to be extracted; c, fulcrum-piece…

### Lever Spring Safety-valve

A form of spring safety-valve, in which a series of bent springs h h h are placed alternately in opposite…

### Third Class Lever

A lever of the third class

### Third class lever

"A lever is an inflexible bar freely movable about a fixed axis called the fulcrum. If the power is…

### Third-class Lever

"In the third and last kind of lever, the weight is placed at one end, the fulcrum at the other end…

### Third Class Lever

"Third class lever." -Comstock 1850

### Third Class Lever

"A Lever of the Third Kind is one in which the power is between the weight and the fulcrum." —Quackenbos…